Under optimized operating parameters, a hard and wear resistant （Ti,Al）N film is prepared on a normalized T8 carbon tool steel substrate by using pulsed high energy density plasma technique. Microstructure and compo...Under optimized operating parameters, a hard and wear resistant （Ti,Al）N film is prepared on a normalized T8 carbon tool steel substrate by using pulsed high energy density plasma technique. Microstructure and composition of the film are analysed by x-ray diffraction, x-ray photoelectron spectroscopy, Auger electron spectroscopy and scanning electron microscopy. Hardness profile and tribological properties of the film are tested with nano- indenter and ring-on-ring wear tester, respectively. The tested results show that the microstructure of the film is dense ahd uniform and is mainly composed of （Ti,Al）N and A1N hard phases. A wide transition interface exists between the film and the normalized T8 carbon tool steel substrate. Thickness of the film is about lO00nm and mean hardness value of the film is about 26 GPa. Under dry sliding wear test conditions, relative wear resistance of the （Ti, Al）N film is approximately 9 times higher than that of the hardened T8 carbon tool steel reference sample. Meanwhile, the （Ti,Al）N film has low and stable friction coefficient compared with the hardened T8 carbon tool steel reference sample.展开更多
A super hard and wear resistant WC film is in-situ prepared on a 0.45%C steel substrate by pulsed high energy density plasma technique at ambient temperature. The microstructure and composition of the film are analyse...A super hard and wear resistant WC film is in-situ prepared on a 0.45%C steel substrate by pulsed high energy density plasma technique at ambient temperature. The microstructure and composition of the film are analysed by x-ray diffraction, x-ray photoelectron spectroscopy, Auger electron spectroscopy and scanning electron microscopy. The hardness profile and tribological behaviour of the film are determined with nano-indenter and wear tester, respectively. The results show that the microstructure of the film was dense and uniform and mainly composed of WC and a small amount of W2 C. A wide mixing interface exists between the film and the 0.45%C steel substrate. The thickness of the film is about 2μm. The hardness and Yang＇s modulus of the film are very high. The film has excellent wear resistance and low friction coefficient under dry sliding wear test conditions.展开更多
Under optimized operating parameters, a wear and corrosion resistant Cr3 Si/γ-Fe composite coating is fabricated on a normalized 0.45% carbon steel substrate by using the plasma transferred arc （PTA） cladding techn...Under optimized operating parameters, a wear and corrosion resistant Cr3 Si/γ-Fe composite coating is fabricated on a normalized 0.45% carbon steel substrate by using the plasma transferred arc （PTA） cladding technique with Fe-Cr-Si elemental powder blend as the precursor material. Mierostructure, microhardness, dry-sliding wear resistance and electrochemical corrosion characteristic of the coating are evaluated. Test results show that the composite coating is mainly composed of primary Cr3Si dendrites and the interdendritic supersaturated iron-base solid solution γ-Fe. Between the Cr3Si/γ-Fe composite coating and the normalized 0.45% carbon steel substrate, there is a narrow metallurgical bonding zone. The Cr3Si/γ-Fe composite coating exhibits high microhardness, excellent wear and corrosion resistance under test conditions.展开更多
文摘Under optimized operating parameters, a hard and wear resistant （Ti,Al）N film is prepared on a normalized T8 carbon tool steel substrate by using pulsed high energy density plasma technique. Microstructure and composition of the film are analysed by x-ray diffraction, x-ray photoelectron spectroscopy, Auger electron spectroscopy and scanning electron microscopy. Hardness profile and tribological properties of the film are tested with nano- indenter and ring-on-ring wear tester, respectively. The tested results show that the microstructure of the film is dense ahd uniform and is mainly composed of （Ti,Al）N and A1N hard phases. A wide transition interface exists between the film and the normalized T8 carbon tool steel substrate. Thickness of the film is about lO00nm and mean hardness value of the film is about 26 GPa. Under dry sliding wear test conditions, relative wear resistance of the （Ti, Al）N film is approximately 9 times higher than that of the hardened T8 carbon tool steel reference sample. Meanwhile, the （Ti,Al）N film has low and stable friction coefficient compared with the hardened T8 carbon tool steel reference sample.
文摘A super hard and wear resistant WC film is in-situ prepared on a 0.45%C steel substrate by pulsed high energy density plasma technique at ambient temperature. The microstructure and composition of the film are analysed by x-ray diffraction, x-ray photoelectron spectroscopy, Auger electron spectroscopy and scanning electron microscopy. The hardness profile and tribological behaviour of the film are determined with nano-indenter and wear tester, respectively. The results show that the microstructure of the film was dense and uniform and mainly composed of WC and a small amount of W2 C. A wide mixing interface exists between the film and the 0.45%C steel substrate. The thickness of the film is about 2μm. The hardness and Yang＇s modulus of the film are very high. The film has excellent wear resistance and low friction coefficient under dry sliding wear test conditions.
文摘Under optimized operating parameters, a wear and corrosion resistant Cr3 Si/γ-Fe composite coating is fabricated on a normalized 0.45% carbon steel substrate by using the plasma transferred arc （PTA） cladding technique with Fe-Cr-Si elemental powder blend as the precursor material. Mierostructure, microhardness, dry-sliding wear resistance and electrochemical corrosion characteristic of the coating are evaluated. Test results show that the composite coating is mainly composed of primary Cr3Si dendrites and the interdendritic supersaturated iron-base solid solution γ-Fe. Between the Cr3Si/γ-Fe composite coating and the normalized 0.45% carbon steel substrate, there is a narrow metallurgical bonding zone. The Cr3Si/γ-Fe composite coating exhibits high microhardness, excellent wear and corrosion resistance under test conditions.
